Today's Message Index:
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0. 12:17 AM - Who is Matt Dralle & What Are The Lists? (Matt Dralle)
1. 05:23 AM - Re: Rotax 912 Preheating (dashwood)
2. 06:55 AM - Re: Re: Rotax 912 Preheating (FLYaDIVE)
3. 08:46 AM - Re: Rotax 912 Preheating (Thom Riddle)
4. 01:07 PM - Re: Re: Rotax 912 Preheating (FLYaDIVE)
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| Subject: | Who is Matt Dralle & What Are The Lists? |
Dear Listers,
Who is Matt Dralle and what exactly are these Lists anyway? I've been working
in the Information Technology industry for over 28 years, primarily in computer
networking design and implementation and more recently as an embedded software
engineer. I have also done a fair amount of work in web design and development.
I started the Matronics Email Lists way back in 1990 shortly after I started building
my RV-4 with about 30 fellow RV builders from around the world. Since
that time, I have added many other types of aircraft related Lists to the line
up and numerous other List related services such as the Forums, Wiki, Archives
and Search Engine just to name a few.
For flexibility and reliability, I have chosen to run all of my own servers locally.
Other List-related systems include a 1 Gigabit, fully switched network
infrastructure, a commercial-grade Netscreen firewall, a Barracuda spam filter,
a local T1 Internet router, and a bonded dual T1 commercial-grade business Internet
connection with full static addressing.
The computer servers include a dual quad-core Linux server for List web services
with 24GB of memory, a quad -core Linux system dedicated to the email processing
List functions, and another standalone Linux system serving as a remote storage
disk farm for the archives, databases, and for an on-line hard drive-based
backup system with multi-terra byts of online storage. This entire system
is protected by three large, commercial-grade uninterrupted power supply systems
(UPS) that assure the Lists are available even during a local power outage!
Speaking of power, imagine how much electricity it takes to run all of these
systems. On the average, the elctric bill is in the neighborhood of $7000-$8000/yr
and the newly upgraded dual-T1 Internet connection runs roughly $6000/yr.
A while back, I upgraded all of the computer racking infrastructure including new
power feeds and dedicated air conditioning for the room that serves as the
Computer Center for the Matronics Email Lists and followed that upgrade up with
a second rack upgrade to house the MONSTER web system that didn't quite fit
into the first rack! Here's a composite photo of the List Computer Center prior
to the addition of the second rack:
http://www.matronics.com/MattDralle-ListComputerCenter.jpg
As you can see, I take running these Lists very seriously and I am dedicated to
providing an always-on, 24x7x365 experience for each and every Lister.
But building and running this system isn't cheap. As I've mentioned many times
before, I don't use commercial advertisments to support any of these systems.
It is supported 100% through List member Contributions! That means you...
and you... and YOU!
To that end, I hold a List Fund Raiser each November and ask that members make
a Contribution to support the continued operation and upgrade of this ever-expanding
system. Its solely YOUR Contributions that keeps it running!
Please make a Contribution today to support these Lists!
http://www.matronics.com/contribution
Or, by dropping a personal check in the mail to:
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Thank you!
Matt Dralle
Matronics Email List Administrator
Message 1
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| Subject: | Re: Rotax 912 Preheating |
http://www.eaa.org/bitsandpieces/articles/2012-11_cold-weather-operations.asp
http://www.avweb.com/news/maint/182846-1.html
--------
Ross Aalexander: CH701 driver 912ul 589tt
It only takes two things to fly, airspeed and money
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=388104#388104
Message 2
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| Subject: | Re: Rotax 912 Preheating |
Hi Ross & Gaggle:
While we al agree that pre-heating is helpful and benificial to our engines
after reading the EAA news letter "Bits & Pieces" one has to note a few
things:
1 - It was written by by Christine Wetherell <EAAbitsandpieces@eaa.org>,
Tanis Aircraft whom is a member of TANIS AIRCRAFT as she even states. So
take what is offered with a grain of salt.
2 - She also makes the statement: "Often, preheating is the only way to get
a cold engine started. Cold fuel doesn't vaporize well,...". That is NOT a
requirement. In the racing world of cars there is a device know as a COOL
CAN (look it up) it is a can that has coil of copper tubing inside it -
Into the can you put Dry Ice. This is to LOWER the temperature of the gas
flowing to the engine. What this does is raise the Specific Gravity
(density) of the gas so MORE molecules of gas are delivered into the
combustion chamber. This increases the Horse Power of the delivered fuel
.
Vaporization takes place inside the cylinder (think high temps).
Atomization takes place in the carburetor (think a super fine spray of
particles).
3 - She uses the term Cold Soaked - In the engineering field this refers to
a steady state temperature for a period of 24 hours or more as called out
in particular environmental testing. Not really appropriate for normal day
night temperature cycling. But, I think we all get the idea that she means
- The engine has been cold and unused for a long time .
4 - Now, this one is TOTALLY WRONG - If you read about 2/3 the way down you
will find this quote which is taken from a Continental Service Letter (SL):
"Preheating is required whenever the engine has been exposed to
temperatures at or below 20=B0F/-7=B0C (wind chill factor) for a period of
two
hours or more." - This is totally incorrect. Why? Because engines
CANNOT experience windchill factor. Windchill is the process of
evaporation of moisture off the skin which reduced the applied temperature
to an effective temperature. The engine does NOT have skin. ALSO - in
most cases the engine is under the cowl so it does not even experience wind
blowing across it.
The person who wrote this for Continental was incorrect and the person
that regurgitated incorrect information did not bother to do their job.
The point where pre-heating becomes advantageous is the freezing point 0
C/32 F. Some engines are temperamental and require it at higher
temperatures. I know one O-360 Lycoming that complains around 40 to 45 F.
I don't know why.
"If you tell a lie loud enough and long enough, it becomes the truth." Leni
n
Do your homework people.
Barry
==================
On Fri, Nov 16, 2012 at 8:23 AM, dashwood <dashwoodlock@hotmail.com> wrote:
> dashwoodlock@hotmail.com>
>
>
> http://www.eaa.org/bitsandpieces/articles/2012-11_cold-weather-operations
.asp
>
>
> http://www.avweb.com/news/maint/182846-1.html
>
> --------
> Ross Aalexander: CH701 driver 912ul 589tt
> It only takes two things to fly, airspeed and money
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=388104#388104
>
>
===========
===========
===========
===========
>
>
Message 3
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| Subject: | Re: Rotax 912 Preheating |
... In the racing world of cars there is a device know as a COOL
CAN (look it up) it is a can that has coil of copper tubing inside it -
Into the can you put Dry Ice. This is to LOWER the temperature of the gas
flowing to the engine. What this does is raise the Specific Gravity
(density) of the gas so MORE molecules of gas are delivered into the
combustion chamber....
When I was a drag racer nearly 50 years ago, I built my own cool cans, but the
purpose for it was not as you stated. The real purpose was to eliminate vapor
lock on hot summer days.
--------
Thom Riddle
Buffalo, NY (9G0)
Kolb Slingshot SS-021
Jabiru 2200A #1574
Diamond Katana DA20-A1
Rotax 912 F3
Don't worry about old age... it doesn't last very long.
- Anonymous
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=388120#388120
Message 4
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| Subject: | Re: Rotax 912 Preheating |
Hey Thom:
You don't look that old. :-)
I did my racing in the late '60's and early '70's.
RACEWAY PARK, Englishtown, NJ
I never heard of the cool can being used for vapor lock. All dependent on
the location of the can and length of the fuel run that might be a concern.
But, in those days engine compartments were HUGE - So big I was able to
climb right in under the hood - Legs and all. Just to do a intake manifold
or a valve job. With all that room I can't see how heat could build that
high, the can was also to be located as close to the Carb as possible. So
that would eliminate the possibility of vapor lock forming. Vapor Lock -
Possible but I don't think probable. Well, at least I
never experienced that problem.
Here are links about how others used the cool can:
http://forums.corral.net/forums/5-0-5-8-engine-tech/556895-whos-running-fuel-cool-can-cooler.html
http://blogs.superchevy.com/6274849/chevy-tech/keep-your-fuel-cool/
http://grassrootsmotorsports.com/forum/grm/fuel-cool-can/10560/page1/
And the list goes on... No mention of Vapor Lock.
Back then I did not know about Density Altitude. But today a friend that
still races has an entire computer program that addresses Density Altitude
and he changes his injectors for the particular conditions.
He still believes in the COOL CAN.
Hey, it can't hoit!
Barry
On Fri, Nov 16, 2012 at 11:45 AM, Thom Riddle <riddletr@gmail.com> wrote:
> >
>
> ... In the racing world of cars there is a device know as a COOL
> CAN (look it up) it is a can that has coil of copper tubing inside it -
> Into the can you put Dry Ice. This is to LOWER the temperature of the gas
> flowing to the engine. What this does is raise the Specific Gravity
> (density) of the gas so MORE molecules of gas are delivered into the
> combustion chamber....
>
>
> When I was a drag racer nearly 50 years ago, I built my own cool cans, but
> the purpose for it was not as you stated. The real purpose was to eliminate
> vapor lock on hot summer days.
>
> --------
> Thom Riddle
> Buffalo, NY (9G0)
>
> Kolb Slingshot SS-021
> Jabiru 2200A #1574
>
> Diamond Katana DA20-A1
> Rotax 912 F3
>
> Don't worry about old age... it doesn't last very long.
> - Anonymous
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=388120#388120
>
>
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